PIC18F2331 MICROCHIP [Microchip Technology], PIC18F2331 Datasheet - Page 256

• Manufacturer Part Number: PIC18F2331
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2331/2431/4331/4431
EXAMPLE 20-1:
FIGURE 20-2:
DS39616B-page 254
T
T
T
Temperature coefficient is only required for temperatures > 25 C. Below 25 C, T
T
T
ACQ
AMP
COFF
C
ACQ
Note:
Note:
Legend: C
=
=
=
–
=
If the converter module has been in Sleep mode, T
V
AIN
For V
Rs
V
I
R
SS
C
R
T
negligible
(Temp – 25 C)(0.005 s/ C)
(50 C – 25 C)(0.005 s/ C) = .13 s
-(C
-(9 pF) (1 k + 6 k + 100 ) ln(0.0004883) s = .49 s + .13 s = .62 s
0 + .62 s + .13 s = .75 s
DD
LEAKAGE
T
PIN
IC
HOLD
SS
AMP
CALCULATING THE MINIMUM REQUIRED ACQUISITION TIME
ANALOG INPUT MODEL
< 2.7V and temperatures below 0ºC, V
HOLD
ANx
C
5 pF
+ T
PIN
) (R
= input capacitance
= threshold voltage
= leakage current at the pin due to
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
= sampling switch resistance
C
various junctions
+ T
IC
COFF
+ R
SS
+ R
V
S
DD
) ln(1/2047) s
V
V
T
T
= 0.6V
= 0.6V
Preliminary
AIN
AMP
should be restricted to range: V
I leakage
± 500 nA
is 2.0 µs from the time the part exits Sleep mode.
R
IC
1k
COFF
V
SS
DD
Sampling
Switch
= 0 s.
6V
5V
4V
3V
2V
R
SS
 2003 Microchip Technology Inc.
AIN
Sampling Switch
5 6 7 8 9 10 11
V
< V
SS
C
HOLD
DD
/2.
= 9 pF
(k )